Scroll-bending machine.



No. 896,116. PATENTED AUG. 18, 1908. V. W. JEWETT. SCROLL BENDING MACHINE.

APPLICATION FILED JAN. 2, 190B.

IN: run a VERNON WILLIAM JEWETT, OF MONTPELIER, VERMONT.

SCROLL-BENDING MACHINE.

Specification of Letters Patent.

Patented Aug. 18, 1908.

Application filed January 2, 1908. Serial No. 408,972.

To all whom it may concern:

Be it known that I, VERNON W. J EWETT, a citizen of the United States, residing at Montgelier, in the county of Washington and tate of Vermont, have invented a new and useful Scroll-Bending Machine, of which the following is a specification.

This invention has reference to improvements in machines for bending scrolls which are designed more particularly for use on polishing wheels, and its object is to provide a machine by which the scrolls may be readily bent into shape from metal strips, such as iron strips.

The invention comprises a rotatable table upon which is mounted a scroll with means for fastening the end of the strip about to be bent, and the scroll is continued in the form of a flexible member which when the table is rotated and the stri has been wound upon the scroll for a predetermined distance, engages the strip and likewise forms a continuation of the scroll so that the strip may be wound into a scroll of a number of turns without interfering with the original placing of the strip at the beginning of the scroll. For this pur ose there is provided a number of segmenta blocks all joined flexibly so as to conform to the shape of the original scroll and thus when wound upon the latter will increase its diameter rogressively.

The invention wilFbe best understood from a consideration of the following detail description taken in connection with the accompanying drawings forming part of this I specification, in which drawings,

Figure 1 is a plan view of the improved machine in one phase of its operation. Fig. 2 is a plan view with parts omitted showing the machine in another phase of its operation. Fig. 3 is an elevation.

Referring to the drawings there is shown a frame 1 upon which the various parts of the machine are supported. This frame is formed with two journal boxes 2, 3, for a vertical shaft 4, the box 3 being provided with an adjustable step bearing 5 for the shaft. The u )pcr end of the shaft 4 carries a circular tabie 5 capable of rotating with the shaft.

Between its bearings the shaft 4 has fast thereon a beveled gear wheel 6 meshing with the pinion 7 upon a drive shaft 8 having one bearing 9 in the frame 1 and another bearing 10 upon a pedestal 11 suitably spaced from the frame 1. Between its bearin s the shaft 8 has the usual tight and loose pu leys 12, 13,

the initial insertion of the end of a strip 16 to be bent into the form of a scroll. The scroll within the slot 15 is formed with a guide rib 16 for a block 17, and the slot 15 or the guide 16 may be slightly tapered so that the block 17'when driven to the inner end of the slot 15 will wedge the strip 16 tightly against the initial end of the spiral wall of the scroll. The slot 15 is formed by an extension or tongue 18 of the scroll block, and fast to the end of this tongue is a chain or other flexible strand 19 upon which are mounted a series of segmenta blocks 20 spaced apart by washers 21 carried by the chain. Instead of the chain a yielding metal strip may be used for the blocks or any other flexible or semiflexible carrier may be employed. At the end of the chain 19 there is formed a handle 22, by means of which the chain and the blocks carried thereby may be guided and manipulated. Leading to the periphery of the table 5 is a trough 23 having its walls 24 and 25, as they approach the table, divergent so that the blocks 20 will be properly guided, as will hereinafter appear. At the end of the wall 24 close to the table 25 is formed a lug or projection 26 serving to engage the strip 16 and direct it to the scroll block 14.

To bend" the strips 16 into spiral or scroll shape, one end of the strip is inserted into the slot 15 and anchored therein by driving the block 17 until the end of the strip is ti htly cramped in said slot. Now, by ap fying .power to the shaft 8 the gear whee 6 is caused to slowly rotateand the table 5 and block 14 participate in this rotation. As the rotation continues the stri 16 is bent around the outer wall of the bloc 14 and is wound thereon. This continuesuntil the tongue 18 begins to move away from the tangential plane followed by the blocks 20. As soon as this occurs the inner faces of the blocks 20, which are curved upon the proper radius, enga e the outer face of the strip 16 and travel around the same as it is bent upon the block 14. Ultimately, the end of the tongue 18 returns to its initial position in space and is followed by the blocks 20. Now, the strip 16 is wound upon the segmental blocks 20 instead of upon the scroll block 14, and these segmental blocks increase the diameter of the scroll progressively in accordance with the thickness of the blocks. The rotation of the table is continuous so long as may be. necessary to wind the entire length of the strip 16, or so much thereof as may be desired, into the form of a scroll.

Since the strip or bandv 16 is wound cold it will have some slight resiliency even when made of soft iron, and consequently will loosen slightly away from the scroll slot 14 P is useful forthe return of the blocks 20 to metal strips, comprisin their initial position when the formed scroll has been removed from the machine.

What is claimed is:-

1. A machine for forming scrolls from i an initial scroll block, means carried by t e block for clamping the strip to said block, and a flexible follower fast to said scrollblock and serving to progressively increase the diameter of the scroll.

2. In a machine for forming scrolls, a rotatable scroll block or form, means for securing a metal strip to said block or form, and a flexible follower for rogressively increasing the size of the-scro comprising a flexible member fast tothe'scroll block, and segmental blocks carried by said flexible member and adapted to coact with the scroll block to progressively increase its diameter;

3. In a machine for forming scrolls, a rotatable scroll block or form, means for securing thereto one end of a strip or band to be formed into a scroll, a flexible strand fast to the scroll block and terminatin at the end remote from the scroll block in a andle, se mental blocks upon said flexible strand, an means for spacing said blocks u on said strand.

4. In a machine for orming scrolls from strips or bands, a scroll block, means for fastemng the end of the strip or band to said .scroll block, a flexible series of segmental blocks attached to said scroll block and ada ted to wind thereon, and a guide for sai series of blocks comprising a trough having divergent sides approaching the scroll block.

5. In amachinefor forming scrolls from strips or bands, a scroll block, means for fastenmg the end of the strip or band to said scroll block, a flexible series of segmental blocks attached to said scroll block and adapted to wind thereon, a guide for said series of blocks comprising a trough having divergent sides a proaching the scroll block, and means for irecting the band to be bent into a scroll toward the scroll block.

In testimony that I claim the foregoing as my own, I have hereto/affixed my signature in the presence of two witnesses.

VERNON WILLIAM J EWETT.

Witnesses:

PHILIP BABNEY, LOUIS BARNEY. 

